网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Which condition is necessary for a substance to burn?（）
A
The temperature of the substance must be equal to or above its fire point
B
The air must contain oxygen in sufficient quantity
C
The mixture of vapors with air must be within the explosive range
D
All of the above
参考答案
参考解析
解析：
暂无解析
更多 “单选题Which condition is necessary for a substance to burn?（）A The temperature of the substance must be equal to or above its fire pointB The air must contain oxygen in sufficient quantityC The mixture of vapors with air must be within the explosive rangeD All of the above” 相关考题
考题
Which of the following is NOT a condition for deadlock?A．StarvationB．Circular waitC．No preemptioD．Mutual Exclusion
考题
In classical physics, the mass of an object had always been associated with an indestructible material substance, with some “stuff” of which all things were thought to be made.
考题
Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?A.RadiationB.ConductionC.Natural convectionD.contact directly
考题
The flash point of a liquid refers to the temperature ______.A.at which a liquid will give off inflammable（易燃的） vaporsB.at which a liquid will burn steadilyC.at which a liquid will explodeD.that a liquid must reach before it will flow readily
考题
Apart from special circumstances，the value of the goods for which compensation must be made，if they have been lost or damaged，______ that which they would have had at the time and place at which they ought to have been delivered in proper condition．A.containsB.remainsC.hasD.is
考题
Which substance is NOT considered to be Oil under the pollution prevention regulations?A.Petroleum and fuel oilB.SludgeC.Oil mixed with dredge spoilD.Oil refuse and oil mixed with wastes
考题
Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
考题
Which substance might be subject to spontaneous combustion ________．A.CoalB.Scrap rubberC.LeatherD.All of the above
考题
Which molten substance is poured into the basket of a wire rope socket being fitted to the end of a wire rope ________．A.BabbittB.BronzeC.LeadD.Zinc
考题
The author gives substance to the passage through the use of___________.A.interviews with authorities in the field of water controls
B.opinion and personal observations
C.definitions which clarify important terms
D.strong argument and persuasion
考题
The United States will do that which is necessary to meet its ______ to its own citizens.A.rules
B.promise
C.principles
D.obligations
考题
public void test（） { try { oneMethod（）； System.out.println（"condition 1"）； } catch （ArrayIndexOutOfBoundsException e） { System.out.println（"condition 2"）； } catch（Exception e） { System.out.println（"condition 3"）； } finally { System.out.println（"finally"）； } } Which will display if oneMethod run normally？（） A、 condition 1B、 condition 2C、 condition 3D、 finally
考题
单选题Which substance is NOT considered to be Oil under the pollution prevention regulations? （）A
Petroleum and fuel oilB
SludgeC
Oil mixed with dredge spoilD
Oil refuse and oil mixed with wastes
考题
单选题Care must be taken to condition the （）in the boiler to prevent scaling, and corrosion, which can weaken the pressure vessel.A
waterB
fuelC
steamD
air
考题
单选题Apart from special circumstances，the value of the goods for which compensation must be made，if they have been lost or damaged，（）that which they would have had at the time and place at which they ought to have been delivered in proper condition.A
containsB
remainsC
hasD
is
考题
单选题During which condition should the operator of a pedestal crane shutdown operations?（）A
BunkeringB
High windsC
Potable water spill on deck
考题
单选题You are designing a group management strategy for users in the finance department. You need to identify the appropriate changes that need to be made to the current group management strategy. You want to accomplish this goal by using the minimum number of groups. What should you do？（）A
Add the finance users to the financeData group to which the necessary permissions have been assigned.B
Add the finance users to the financeGG group to which the necessary permissions have been assigned.C
Add the finance users to the financeGG group. Then add the financeGG group to the financeData group to which the necessary permissions have been assigned.D
Add the finance users to the financeGG group. Add the financeGG group to the financeUG group to the financeDat group to which the necessary permissions have been assigned.
考题
单选题The quantity or condition which is measured and controlled is known as the （）A
controlled variableB
manipulated variableC
set pointD
control point
考题
多选题Which three are true regarding the use of outer joins? （）AYou cannot use IN operator in a condition that involves an outerjoin.BYou use (+) on both sides of the WHERE condition to perform an outerjoin.CYou use (*) on both sides of the WHERE condition to perform an outerjoin.DYou use an outerjoin to see only the rows that do not meet the join condition.EIn the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.FYou cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.
考题
单选题The flash point of a liquid refers to the temperature （）A
at which a liquid will give off inflammable vaporsB
at which a liquid will burn steadilyC
at which a liquid will explodeD
that a liquid must reach before it will flow readily
考题
单选题The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the （）A
flash pointB
fire pointC
upper explosive limitD
lower explosive limit
考题
单选题Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）A
Pour pointB
Cloud pointC
VacuumD
Pressure
考题
单选题Which condition is necessary for a substance to burn?（）A
The temperature of the substance must be equal to or above its fire pointB
The air must contain oxygen in sufficient quantityC
The mixture of vapors with air must be within the explosive rangeD
All of the above
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
单选题What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）A
RefrigeratorB
RefrigerantC
Cooling mediumD
Brine
考题
单选题To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.A
re-adjust the discharge pressureB
clean the expansion valve screenC
add refrigerantD
adjust the expansion valve
考题
单选题A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）A
carbonB
vanadiumC
calciumD
hydrogen
考题
单选题Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）A
temperature of the intake airB
friction within the engineC
mechanical condition of the superchargerD
mechanical condition of the turbocharger
热门标签
最新试卷
